create a data set

[Ronein]

Hello

Why in the output I see only one raw?

Data have;
input ID X1 X3 W1 W3 W2 X2 X4 X5 X6 W4 W5 W6 Z1 Z2 Y1 Y2 Y3 Z3 Z4 Z5 Y4 Y5 Y6;
Cards;
999 1 2 3 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
888 3 2 1 5 6 7 8 6 10 11 17 13 14 15 16 17 18 21 20 21 22 25
;
Run;

[PeterClemmensen · Accepted solution]

Because you have 24 variables and 23 values specified in the first row. That is why SAS places the value 888 (from the second datalines row) in the last variable in the resulting data set. 

Use Missover / Flowover etc. to control the input buffer.